21056608 has 24 divisors (see below), whose sum is σ = 43894872. Its totient is φ = 9908736.

The previous prime is 21056597. The next prime is 21056653. The reversal of 21056608 is 80665012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18810 + ... + 19897.

It is an arithmetic number, because the mean of its divisors is an integer number (1828953).

Almost surely, 2^21056608 is an apocalyptic number.

It is an amenable number.

21056608 is an abundant number, since it is smaller than the sum of its proper divisors (22838264).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21056608 is a wasteful number, since it uses less digits than its factorization.

21056608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38734 (or 38726 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 21056608 is about 4588.7479773899. The cubic root of 21056608 is about 276.1400955082.

The spelling of 21056608 in words is "twenty-one million, fifty-six thousand, six hundred eight".